Comfort Turns to Shock: KuaiLu Flip Flops Tested for Arch Relief...Summer Beach Stars! We took the KuaiLu Sports Flip Flops on a summer beach trip, hoping their orthotic arch support would save our feet. As promised, the cushioned soles and contoured insoles provided immediate relief—our plantar fasciitis symptoms eased within minutes. The thong straps felt secure, balancing comfort and stability on uneven sand. But the real surprise came when we忘了 to wear them. Our arches ached afterward, proving just how much these shoes supported us. While they’ll never replace high-quality hiking boots for rugged trails, KuaiLu flip flops are perfect for casual summer wear. Size 9, we found, runs true to standard, though wider feet might need an extra half size. Our feet stayed cooler than expected, thanks to the breathable matting, but the outer sole scuffs easily. Still, for beach lounging and light walks, these sandals deliver a winning mix of arch relief and summer-style.